An important factor in the function of the immune system is the ability to line all external surfaces of the body (digestive, skin, respiratory, and reproductive) with secure cell junctions. This prevents pathogens from entering the body. Given this, which of the following is true?
A)Desmosomes, on their own, provide an impermeable seal between cells.
B)Connexons, composed of transmembrane proteins, hold cells together.
C)Epithelia are the only cells that are likely to use all three cell junction types (tight junctions, desmosomes, and gap junctions).
D)Most critical to the cell junction is the gap junction.
C)Epithelia are the only cells that are likely to use all three cell junction types (tight junctions, desmosomes, and gap junctions).
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The mechanism whereby benign enlargement of the prostate affects urinary function in older men includes which of the following?
A) It may compress the membranous urethra. B) It may compress the prostatic urethra. C) It may compress the opening of the ureters into the bladder. D) It may compress the body of the bladder. E) None of the answers are correct.
For the majority of the GI tract, which layer(s) of the wall contain smooth muscle?
A. Serosa only B. Mucosa and adventitia C. Submucosa and muscularis D. Muscularis only E. Mucosa and muscularis
Which of the following statements is not true?
A. Albumin contributes to blood viscosity. B. Albumin is produced in the liver. C. Albumin is a relatively rare plasma protein. D. Albumin contributes to osmolarity. E. Albumin affects blood volume and pressure.
Which of the following is NOT a granulocyte?
A. Basophil B. Neutrophil C. Eosinophil D. Monocyte